In the area of atmospheric chemistry, I have learned that the heterogeneous oxidation of SO2 is one of the important pathways for sulfate formation. The reactions of SO2 oxidation in mineral, soot particles have been confirmed.
The adsorption or uptake of SO2 on the particle surface" is the initial process of the transformation. I have heard that adsorption is the surface-based process of gases or ions and create a film wiki reference.
What's the difference between the adsorption and uptake processes?